The utility model discloses a special spanner for gas welding and gas cutting operation and belongs to the field of a spanner. The special spanner comprises a spanner body, wherein one end of the spanner body is a monkey spanner with the adjustable size, the other end of the spanner body is provided with a sleeve body, an inwards opened square hole is arranged in the sleeve body, the inner side of the square hole is formed by sequentially connecting four planes with the same size, and the included angle between every two adjacent surfaces is respectively 90 degrees. The monkey spanner provided by the utility model can be used for screwing or unscrewing screw nuts during the operation by workers, the sleeve body can be used for conveniently opening and closing an oxygen bottle and an acetylene bottle, and the special spanner has the advantages that the structure is simple, the use is convenient, the design is reasonable, and the manufacture is easy.